How To Fix TR_AUSL643 - Connection to RFC destination &1 could not be established

SAP Error Message - Details

• Message type: E = Error

• Message class: TR_AUSL - Software Delivery Composer Messages

• Message number: 643

• Message text: Connection to RFC destination &1 could not be established

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message TR_AUSL643 - Connection to RFC destination &1 could not be established ?

  The SAP error message TR_AUSL643 indicates that there is an issue with establishing a connection to a Remote Function Call (RFC) destination. This can occur for various reasons, and understanding the cause is essential for troubleshooting. Here are some common causes, potential solutions, and related information:
  Causes:
  
  Incorrect RFC Destination Configuration: The RFC destination may not be configured correctly in the SAP system.
  Network Issues: There may be network connectivity issues between the SAP system and the target system.
  Authorization Issues: The user credentials used for the RFC connection may not have the necessary authorizations.
  Target System Down: The target system may be down or not reachable.
  Firewall Restrictions: Firewalls may be blocking the connection to the target system.
  SAP Gateway Issues: The SAP Gateway service may not be running or configured properly.
  
  Solutions:
  
  
  Check RFC Destination Configuration:
  
  Go to transaction SM59 in the SAP GUI.
  Locate the RFC destination that is causing the issue.
  Verify that the connection parameters (such as the target host, system number, client, user, and password) are correct.
  
  
  
  Test the Connection:
  
  In transaction SM59, select the RFC destination and use the "Connection Test" option to check if the connection can be established.
  
  
  
  Check Network Connectivity:
  
  Ensure that the network connection between the SAP system and the target system is functioning properly. You can use tools like ping or telnet to test connectivity.
  
  
  
  Review User Authorizations:
  
  Ensure that the user credentials used for the RFC connection have the necessary authorizations to access the target system.
  
  
  
  Check Target System Status:
  
  Verify that the target system is up and running. If it is down, you will need to wait until it is back online.
  
  
  
  Firewall Configuration:
  
  Check if there are any firewall rules that might be blocking the connection. Work with your network team to ensure that the necessary ports are open.
  
  
  
  SAP Gateway Configuration:
  
  Ensure that the SAP Gateway service is running on the SAP system. You can check this in transaction SMGW.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and the developer trace files (transaction ST22) for any additional error messages that might provide more context.
  
  
  
  Related Information:
  
  RFC Destinations: RFC destinations are defined in transaction SM59 and are used to connect to other SAP systems or non-SAP systems.
  SAP Notes: Check SAP Notes for any known issues or patches related to RFC connections.
  Documentation: Refer to SAP Help documentation for detailed information on configuring and troubleshooting RFC connections.
  
  By following these steps, you should be able to identify and resolve the issue causing the TR_AUSL643 error message. If the problem persists, consider reaching out to your SAP Basis team or SAP support for further assistance.